Patchwork [3/3] udp: make use of static_key_slow_set_true() interface

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Submitter jbaron@akamai.com
Date June 28, 2013, 10:30 p.m.
Message ID <7fe0eaba62a8529b387ddb3205713d8bb6156ec1.1372457176.git.jbaron@akamai.com>
Download mbox | patch
Permalink /patch/255689/
State Changes Requested
Delegated to: David Miller
Headers show

Comments

jbaron@akamai.com - June 28, 2013, 10:30 p.m.
Make use of the simpler API.

Signed-off-by: Jason Baron <jbaron@akamai.com>
---
 net/ipv4/udp.c |    9 ++++-----
 net/ipv6/udp.c |    9 ++++-----
 2 files changed, 8 insertions(+), 10 deletions(-)
Steven Rostedt - June 29, 2013, 3:13 a.m.
On Fri, 2013-06-28 at 22:30 +0000, jbaron@akamai.com wrote:
> Make use of the simpler API.

Need to make the change log much more descriptive. Never assume someone
in the future that looks up a change to this file will know about other
commits that led to this. Each change log should be sufficient to stand
on its own.

Explain why this patch is needed. And it's not about the use of a
simpler API.

It actually fixes a real bug.


> 
> Signed-off-by: Jason Baron <jbaron@akamai.com>
> ---
>  net/ipv4/udp.c |    9 ++++-----
>  net/ipv6/udp.c |    9 ++++-----
>  2 files changed, 8 insertions(+), 10 deletions(-)
> 
> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> index 0bf5d39..b8d0029 100644
> --- a/net/ipv4/udp.c
> +++ b/net/ipv4/udp.c
> @@ -1421,11 +1421,10 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
>  
>  }
>  
> -static struct static_key udp_encap_needed __read_mostly;
> +static struct static_key_boolean udp_encap_needed __read_mostly;
>  void udp_encap_enable(void)
>  {
> -	if (!static_key_enabled(&udp_encap_needed))
> -		static_key_slow_inc(&udp_encap_needed);
> +	static_key_slow_set_true(&udp_encap_needed);
>  }
>  EXPORT_SYMBOL(udp_encap_enable);
>  
> @@ -1450,7 +1449,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
>  		goto drop;
>  	nf_reset(skb);
>  
> -	if (static_key_false(&udp_encap_needed) && up->encap_type) {
> +	if (static_key_false(&udp_encap_needed.key) && up->encap_type) {

I wonder if we should add a static_bool_key_false(), because that added
".key" is a bit confusing.

-- Steve


>  		int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
>  
>  		/*
> @@ -1773,7 +1772,7 @@ void udp_destroy_sock(struct sock *sk)
>  	bool slow = lock_sock_fast(sk);
>  	udp_flush_pending_frames(sk);
>  	unlock_sock_fast(sk, slow);
> -	if (static_key_false(&udp_encap_needed) && up->encap_type) {
> +	if (static_key_false(&udp_encap_needed.key) && up->encap_type) {
>  		void (*encap_destroy)(struct sock *sk);
>  		encap_destroy = ACCESS_ONCE(up->encap_destroy);
>  		if (encap_destroy)
> diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
> index 42923b1..94a4091 100644
> --- a/net/ipv6/udp.c
> +++ b/net/ipv6/udp.c
> @@ -573,11 +573,10 @@ static __inline__ void udpv6_err(struct sk_buff *skb,
>  	__udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
>  }
>  
> -static struct static_key udpv6_encap_needed __read_mostly;
> +static struct static_key_boolean udpv6_encap_needed __read_mostly;
>  void udpv6_encap_enable(void)
>  {
> -	if (!static_key_enabled(&udpv6_encap_needed))
> -		static_key_slow_inc(&udpv6_encap_needed);
> +	static_key_slow_set_true(&udpv6_encap_needed);
>  }
>  EXPORT_SYMBOL(udpv6_encap_enable);
>  
> @@ -590,7 +589,7 @@ int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
>  	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
>  		goto drop;
>  
> -	if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
> +	if (static_key_false(&udpv6_encap_needed.key) && up->encap_type) {
>  		int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
>  
>  		/*
> @@ -1300,7 +1299,7 @@ void udpv6_destroy_sock(struct sock *sk)
>  	udp_v6_flush_pending_frames(sk);
>  	release_sock(sk);
>  
> -	if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
> +	if (static_key_false(&udpv6_encap_needed.key) && up->encap_type) {
>  		void (*encap_destroy)(struct sock *sk);
>  		encap_destroy = ACCESS_ONCE(up->encap_destroy);
>  		if (encap_destroy)


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jbaron@akamai.com - July 1, 2013, 4:20 a.m.
On 06/28/2013 11:13 PM, Steven Rostedt wrote:
> On Fri, 2013-06-28 at 22:30 +0000, jbaron@akamai.com wrote:
>> Make use of the simpler API.
> Need to make the change log much more descriptive. Never assume someone
> in the future that looks up a change to this file will know about other
> commits that led to this. Each change log should be sufficient to stand
> on its own.
>
> Explain why this patch is needed. And it's not about the use of a
> simpler API.
>
> It actually fixes a real bug.
>
>
>> Signed-off-by: Jason Baron <jbaron@akamai.com>
>> ---
>>   net/ipv4/udp.c |    9 ++++-----
>>   net/ipv6/udp.c |    9 ++++-----
>>   2 files changed, 8 insertions(+), 10 deletions(-)
>>
>> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
>> index 0bf5d39..b8d0029 100644
>> --- a/net/ipv4/udp.c
>> +++ b/net/ipv4/udp.c
>> @@ -1421,11 +1421,10 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
>>   
>>   }
>>   
>> -static struct static_key udp_encap_needed __read_mostly;
>> +static struct static_key_boolean udp_encap_needed __read_mostly;
>>   void udp_encap_enable(void)
>>   {
>> -	if (!static_key_enabled(&udp_encap_needed))
>> -		static_key_slow_inc(&udp_encap_needed);
>> +	static_key_slow_set_true(&udp_encap_needed);
>>   }
>>   EXPORT_SYMBOL(udp_encap_enable);
>>   
>> @@ -1450,7 +1449,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
>>   		goto drop;
>>   	nf_reset(skb);
>>   
>> -	if (static_key_false(&udp_encap_needed) && up->encap_type) {
>> +	if (static_key_false(&udp_encap_needed.key) && up->encap_type) {
> I wonder if we should add a static_bool_key_false(), because that added
> ".key" is a bit confusing.
>
> -- Steve
>

Yeah - that is sort of ugly, but it avoids introducing a new branch API 
call. That said, a 'static_bool_key_false()' would probably be a simple 
wrapper function.

-Jason


>>   		int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
>>   
>>   		/*
>> @@ -1773,7 +1772,7 @@ void udp_destroy_sock(struct sock *sk)
>>   	bool slow = lock_sock_fast(sk);
>>   	udp_flush_pending_frames(sk);
>>   	unlock_sock_fast(sk, slow);
>> -	if (static_key_false(&udp_encap_needed) && up->encap_type) {
>> +	if (static_key_false(&udp_encap_needed.key) && up->encap_type) {
>>   		void (*encap_destroy)(struct sock *sk);
>>   		encap_destroy = ACCESS_ONCE(up->encap_destroy);
>>   		if (encap_destroy)
>> diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
>> index 42923b1..94a4091 100644
>> --- a/net/ipv6/udp.c
>> +++ b/net/ipv6/udp.c
>> @@ -573,11 +573,10 @@ static __inline__ void udpv6_err(struct sk_buff *skb,
>>   	__udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
>>   }
>>   
>> -static struct static_key udpv6_encap_needed __read_mostly;
>> +static struct static_key_boolean udpv6_encap_needed __read_mostly;
>>   void udpv6_encap_enable(void)
>>   {
>> -	if (!static_key_enabled(&udpv6_encap_needed))
>> -		static_key_slow_inc(&udpv6_encap_needed);
>> +	static_key_slow_set_true(&udpv6_encap_needed);
>>   }
>>   EXPORT_SYMBOL(udpv6_encap_enable);
>>   
>> @@ -590,7 +589,7 @@ int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
>>   	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
>>   		goto drop;
>>   
>> -	if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
>> +	if (static_key_false(&udpv6_encap_needed.key) && up->encap_type) {
>>   		int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
>>   
>>   		/*
>> @@ -1300,7 +1299,7 @@ void udpv6_destroy_sock(struct sock *sk)
>>   	udp_v6_flush_pending_frames(sk);
>>   	release_sock(sk);
>>   
>> -	if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
>> +	if (static_key_false(&udpv6_encap_needed.key) && up->encap_type) {
>>   		void (*encap_destroy)(struct sock *sk);
>>   		encap_destroy = ACCESS_ONCE(up->encap_destroy);
>>   		if (encap_destroy)
>

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Steven Rostedt - July 1, 2013, 2:28 p.m.
On Mon, 2013-07-01 at 00:20 -0400, Jason Baron wrote:
>   
> >> @@ -1450,7 +1449,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
> >>   		goto drop;
> >>   	nf_reset(skb);
> >>   
> >> -	if (static_key_false(&udp_encap_needed) && up->encap_type) {
> >> +	if (static_key_false(&udp_encap_needed.key) && up->encap_type) {
> > I wonder if we should add a static_bool_key_false(), because that added
> > ".key" is a bit confusing.
> >
> > -- Steve
> >
> 
> Yeah - that is sort of ugly, but it avoids introducing a new branch API 
> call. That said, a 'static_bool_key_false()' would probably be a simple 
> wrapper function.

My main concern was to keep true/false separate from counters to
document how this is being used. A simple wrapper would work too.

-- Steve


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Patch

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 0bf5d39..b8d0029 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1421,11 +1421,10 @@  static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 
 }
 
-static struct static_key udp_encap_needed __read_mostly;
+static struct static_key_boolean udp_encap_needed __read_mostly;
 void udp_encap_enable(void)
 {
-	if (!static_key_enabled(&udp_encap_needed))
-		static_key_slow_inc(&udp_encap_needed);
+	static_key_slow_set_true(&udp_encap_needed);
 }
 EXPORT_SYMBOL(udp_encap_enable);
 
@@ -1450,7 +1449,7 @@  int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 		goto drop;
 	nf_reset(skb);
 
-	if (static_key_false(&udp_encap_needed) && up->encap_type) {
+	if (static_key_false(&udp_encap_needed.key) && up->encap_type) {
 		int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
 
 		/*
@@ -1773,7 +1772,7 @@  void udp_destroy_sock(struct sock *sk)
 	bool slow = lock_sock_fast(sk);
 	udp_flush_pending_frames(sk);
 	unlock_sock_fast(sk, slow);
-	if (static_key_false(&udp_encap_needed) && up->encap_type) {
+	if (static_key_false(&udp_encap_needed.key) && up->encap_type) {
 		void (*encap_destroy)(struct sock *sk);
 		encap_destroy = ACCESS_ONCE(up->encap_destroy);
 		if (encap_destroy)
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 42923b1..94a4091 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -573,11 +573,10 @@  static __inline__ void udpv6_err(struct sk_buff *skb,
 	__udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
 }
 
-static struct static_key udpv6_encap_needed __read_mostly;
+static struct static_key_boolean udpv6_encap_needed __read_mostly;
 void udpv6_encap_enable(void)
 {
-	if (!static_key_enabled(&udpv6_encap_needed))
-		static_key_slow_inc(&udpv6_encap_needed);
+	static_key_slow_set_true(&udpv6_encap_needed);
 }
 EXPORT_SYMBOL(udpv6_encap_enable);
 
@@ -590,7 +589,7 @@  int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto drop;
 
-	if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
+	if (static_key_false(&udpv6_encap_needed.key) && up->encap_type) {
 		int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
 
 		/*
@@ -1300,7 +1299,7 @@  void udpv6_destroy_sock(struct sock *sk)
 	udp_v6_flush_pending_frames(sk);
 	release_sock(sk);
 
-	if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
+	if (static_key_false(&udpv6_encap_needed.key) && up->encap_type) {
 		void (*encap_destroy)(struct sock *sk);
 		encap_destroy = ACCESS_ONCE(up->encap_destroy);
 		if (encap_destroy)